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1. Taxonomy A biological specimen that is the opposite sex of a holotype.
2. Immunology Any of several variants in the constant region of a given class or subclass of immunoglobulins that are caused by allelic variation and differ from individual to individual.

al′lo·typ′ic (-tĭp′ĭk) adj.
al′lo·ty′py (-tī′pē) n.


1. (Biology) biology an additional type specimen selected because of differences from the original type specimen, such as opposite sex or morphological details
2. (Biology) immunol any of the variant forms of a particular immunoglobulin found among members of the same species


(ˈæl əˌtaɪp)

1. Biol. a type specimen of the sex opposite to that of the holotype.
2. an antibody that acts as an antigen to other antibodies of the same species that have variant molecular sites.
al`lo•typ′ic (-ˈtɪp ɪk) adj.
al′lo•typ`y (-ˌtaɪ pi) n.